Characteristic overlay factor	Print run weight per page in g/m²	EN equivalent (informative)	Typical value in µm	Density in g/cm
GI40/40	40-60	Z100	5,6-8,5	7,1
GI50/50	50-70		7,0-9,9	7,1
GI60/60	60-90	Z140	8,5-12,7	7,1
GI70/70	70-100		9,9-14,1	7,1
GI85/85	85-115		12,0-16,2	7,1
GI115/115	115-155	Z275	16,2-21,8	7,1

Characteristic overlay factor	Print run weight per page in g/m²	EN equivalent (informative)	Typical value in µm	Density in g/cm
EG12/12	12-32	ZE25/25	1,7-4,5	7,1
EG18/18	18-38		2,5-5,4	7,1
EC29/29	29-49	ZE50/50	4,1-6,9	7,1
EG47/47	47-61	ZE75/75	6,6-8,6	7,1
EG50/50	50-70		7,0-9,9	7,1
EG53/53	53-73		7,5-10,3	7,1
EG60/60	60-80		8,5-11,3	7,1
EG65/65	65-85	ZE100/100	9,2-12,0	7,1
EG70/70	70-90		9-9-12,7	7,1

Characteristic overlay factor	Print run weight per page in g/m²	EN equivalent (informative)	Typical value in µm	Density in g/cm
GA40/40	40-60	ZF100	5,6-8,5	7,1
GA50/50	50-80	ZF120	7,0-11,3	7,1

Characteristic overlay factor	Print run weight per page in g/m²	EN equivalent (informative)	Typical value in µm	Density in g/cm
AS30/30	30-65	AS80	10-20	3,0
AS45/45	45-85	AS120	15-28	3,0

Characteristic overlay factor	Print run weight per page in g/m²	EN equivalent (informative)	Typical value in µm	Density in g/cm
ZM30/30	30-55	ZM70	4,4-8,6	6,4-6,8
ZM40/40	40-65	ZM90	5,9-10,2	6,4-6,8
ZM50/50	50-80	ZM120	7,4-12,5	6,4-6,8

In addition to the basic steel grades, the surfaces are also standardized in the recommendation of the German Association of the Automotive Industry (VDA).
VDA 239-100 includes the following coatings.

Coating and surface types in accordance with VDA 239-100
The coating is specified by the type of coating and the coating weight in g/m² for each side. Uncoated flat products are specified by specifying “UC” (Uncoated) instead of a coating type and coating weight. The usual surface type is indicated by a “U” for cold rolled, non-uncoated parts. Outer skin parts are specified by an “E”. For unaddressed hot-rolled products with no special surface finish requirements, the “U” surface type can be omitted.

Electrolytic galvanizing (EG)
Electrolytically applied zinc coating with a zinc content of at least 99.9% by mass, which is applied galvanically as a coil coating to a suitably prepared steel surface.

Hot-dip coating with zinc coating (hot-dip galvanizing, GI)
Application of a zinc coating by immersing appropriately prepared strip in a molten bath with a zinc content of at least 99% by mass.

Hot-dip coating with zinc-iron alloy coating (galvannealed, GA)
This zinc-iron alloy coating is created by immersing appropriately prepared strip in a molten bath with a zinc content of at least
99% by mass and subsequent heat treatment. During this process, iron diffuses into the zinc layer. The resulting coating has a uniform
matt gray appearance and an iron content of usually 8 to 13% by mass.

Hot-dip coating with aluminum-silicon coating (AS)
Application of an aluminum-silicon coating by immersing appropriately prepared strip in a molten bath consisting of aluminum and 8 to 11
mass % silicon.

Hot-dip coating with zinc-magnesium coating (ZM)
Application of a zinc-magnesium coating by immersing appropriately prepared strip in a molten zinc bath containing magnesium and
aluminum. The element contents in the coating, including the Fe2Al5 inhibition layer, are 1.0 – 2.0 mass % magnesium and 1.0 – 3.0 mass % aluminum.

Examples:

Surface for non-outer skin parts – “U”, Unexposed
Slight surface defects are permissible as long as they do not impair the workability and adhesion for subsequent coatings.

Surface for outer skin parts – “E”, Exposed
The tested side of surface type “E” must enable a uniform quality paint finish. It must not have any defects or imperfections, such as micro-shells or zinc bubbles, which lead to paint defects in the subsequent process (during painting). The other side must at least correspond to surface type “U”. By agreement, both sides can also be supplied in surface type “E”.

Initial details can be found in the tables above. Furthermore, you can download the complete excerpt from VDA 239-100 in our Quality Guide (QG) with the corresponding values via the previous link.